CN103107514A - Detection and protection method and system of electricity leakage on outer surface of electrical equipment - Google Patents
Detection and protection method and system of electricity leakage on outer surface of electrical equipment Download PDFInfo
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- CN103107514A CN103107514A CN2011103850964A CN201110385096A CN103107514A CN 103107514 A CN103107514 A CN 103107514A CN 2011103850964 A CN2011103850964 A CN 2011103850964A CN 201110385096 A CN201110385096 A CN 201110385096A CN 103107514 A CN103107514 A CN 103107514A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
- H01H47/004—Monitoring or fail-safe circuits using plural redundant serial connected relay operated contacts in controlled circuit
- H01H47/005—Safety control circuits therefor, e.g. chain of relays mutually monitoring each other
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/14—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to occurrence of voltage on parts normally at earth potential
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
- H02H3/162—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for ac systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
Provided is a detection and protection method and a detection and protection system of electricity leakage on an outer surface of electrical equipment. The detection and protection method and the detection and protection system of the electricity leakage on the outer surface of the electrical equipment are used for detecting and protecting the electricity leakage on the outer surface of the electrical equipment because the electrical equipment is poor in insulation or power supply is wrong in wiring. A current channel (2) is built between an electrical equipment neutral line (N') and an electrical equipment outer surface (G'), the size of a current is monitored, a human body is in no need of contacting with the electrical equipment outer surface (G'), the electricity leakage on the outer surface can be found, and connection between the electrical equipment and a power source is disconnected, and alarm is indicated to be carried out. Through arrangement of a power source channel, a leakage protection system can still obtain a working power source to normally work under the condition that the wiring between the electrical equipment and the power source is wrong. Under the condition that the electrical equipment outer surface (G') is arranged in an unstable mode, the detection and protection method and the detection and protection system of the electricity leakage on the outer surface of the electrical equipment still can exactly find out the electricity leakage on the outer surface of the electrical equipment, and indicate alarm, or disconnects the connection between the electrical equipment and the power source. The detection and protection method and the detection and protection system of the electricity leakage on the outer surface of the electrical equipment are simple in structure and low in cost, and can be widely used.
Description
Technical field the present invention relates to a kind of detection of electrical leakage means of defence and system, particularly relates to a kind of detection means of defence and system of electrical equipment appearance electric leakage.
In the use procedure of background technology household electrical appliance, because the reasons such as defective insulation or power supply wiring mistake may cause the electrical equipment appearance charged, if at this moment the user contacts appearance, may cause electric current to flow to the earth through human body, cause casualties.Avoid casualties thereby the electrical equipment appearance reliably is connected with power ground or with conductor, the direct ground connection of electrical equipment appearance can be directly imported the earth with the appearance electric leakage, but the electrical equipment appearance do not have good earth in actual applications in many cases.
Many methods are arranged and be used for taking precautions against according to the earth leakage protective device that these methods are developed the harm that the electric leakage of electrical equipment appearance causes human body.the residual current operated protective device of CNS GB6829--86 " residual current operated protective device " and international standard IEC755 (1983) " General Requirements of aftercurrent action protecting equipment " regulation, adopted the method that detects residual current that electric leakage is protected, its principle is by elementary as current transformer the power supply phase line of connecting circuit (three-phase or single-phase) and the neutral line, the phase line current that flows under normal circumstances instrument transformer equals to flow out the neutral current of instrument transformer, residual current is zero, the secondary output voltage of the current transformer corresponding with primary current is also zero.When causing appearance charged due to the defective insulation between power supply phase line and electrical equipment appearance, if human body contacts with appearance, part phase line current will be through human body and the earth, but not the neutral line, return to the power supply neutral point, make the phase line current in current transformer no longer equal neutral current, the secondary generation voltage of current transformer.This voltage process amplification driving circuit amplification rear drive executive circuit deenergization is connected with load, thereby has protected personal safety.But this method is under complexity power supply environment, and charged from the electrical equipment appearance that other power supply phase lines leakages are come, without current transformer, therefore the current transformer perception can not play protective action less than leakage current due to leakage current at this moment.Chinese patent ZL200520102796.8 " monolithic processor control device of the electrified washing-drying integral machine of transformer limited voltage ground wire " has provided another earth leakage protective device; its testing circuit is monitored the current potential of the neutral line and electrical equipment appearance with transformer and voltage comparator, thereby prevents the harm that the appearance electric leakage causes.But this method and apparatus connects the neutral line and electrical equipment appearance with transformer, when user mistake when intermodulation is connected with the neutral line with phase line, the phase line power supply can be connected to the electrical equipment appearance by transformer, the people is for causing appearance charged, if human body contact appearance, thereby the leakage current of the human body of flowing through may be greater than human-body safety electric current harmful to human.
Above-mentioned method and apparatus based on residual current detection will just trigger being connected of earth leakage protective device cut-out electrical equipment and power supply after the electrical equipment appearance of human body contact electrification produces shock current.If earth leakage protective device is because own fault and (for example 0.1 second) above-mentioned power supply of internal cutting off at the appointed time may cause the harm to human body.Above-mentioned method and apparatus based on current potential between the monitoring neutral line and electrical equipment appearance does not limit the charged issuable leakage current of appearance that measuring circuit causes, and may cause the harm to human body yet.
Above-mentioned existing method and apparatus, mainly for the charged protection of electrical equipment appearance in power supply phase line and power supply neutral line connecting circuit phase line and electrical equipment neutral line situation, do not consider the possible appearance electric leakage that causes such as the faulty operation due to the appearance that power supply phase line or the neutral line is connected to mistakenly electrical equipment.Simultaneously; the amplification executive circuit of above-mentioned existing method and apparatus all directly is connected to obtain working power with the power supply that is detected; leak electricity for the appearance that above-mentioned faulty operation causes; because causing the amplification executive circuit of earth leakage protective device, false wiring loses working power; even if make test charged to appearance, earth leakage protective device also can't be worked.
summary of the invention the object of the invention is to overcome the formerly above-mentioned deficiency of method and apparatus, a kind of detection means of defence and system thereof of electrical equipment appearance electric leakage are proposed, even if power end do not have earth connection can with or the electrical equipment appearance there is no ground connection, no matter that the appearance that causes of the wiring error between appearance that between power supply and electrical equipment appearance, defective insulation causes charged or power supply and electrical equipment is charged, can in the situation that the electrical equipment neutral line be connected with the power supply neutral line, at human body with before the electrical equipment appearance contacts, detect the charged situation of appearance and cut off the electricity supply and being connected of electrical equipment, can be in the situation that electrical equipment neutral line misconnection power supply phase line when human body contacts with the electrical equipment appearance, produce predefined electric current, cut off the electricity supply and being connected of electrical equipment.Less than the human-body safety electric current, even if leakage protection system lost efficacy, can not cause personal injury due to this predefined electric current yet.And this method and system can in various wiring situation, obtain working power from tested power supply.Principle of the present invention is: single-phase or three phase mains no matter, and in the correct wiring situation, power supply phase line L should circuit closer phase line L ', and power supply neutral line N should circuit closer neutral line N ', and power ground should circuit closer appearance G '.When above-mentioned wiring error and power ground disappearance, electrical equipment appearance G ' does not have in the situation of ground connection, and the situation of possible false wiring has:
1. power supply phase line L circuit closer neutral line N ', power supply neutral line N circuit closer phase line L '.This moment, electrical equipment appearance G ' was not charged, and electrical equipment can be worked;
2. power supply phase line L circuit closer phase line L ', power supply neutral line N circuit closer appearance G '.This moment, electrical equipment appearance G ' was not charged, and electrical equipment can not be worked;
3. power supply phase line L circuit closer appearance G ', power supply neutral line N circuit closer phase line L '.This moment, electrical equipment appearance G ' was charged, and electrical equipment can not be worked;
4. power supply phase line L circuit closer neutral line N ', power supply neutral line N circuit closer appearance G '.This moment, electrical equipment appearance G ' was not charged, and electrical equipment can not be worked;
5. power supply phase line L circuit closer appearance G ', power supply neutral line N circuit closer neutral line N '.This moment, electrical equipment appearance G ' was charged, and electrical equipment can not be worked.
In above-mentioned 5 kinds of possible false wiring situations, 5 electrical equipment all can not be worked from situation 2 to situation, and wherein situation 3 and situation 5 have also caused appearance charged, therefore all should be protected.Be not difficult to find out, from situation 2 to situation 5, electrical equipment appearance G ' has been connected in power supply phase line L and neutral line N, and a remaining power line is not to be connected with electrical equipment neutral line N ', is exactly to be connected with electrical equipment phase line L '.That is to say if suitable current channel is set, 5, current direction electrical equipment appearance G ' can arranged from situation 2 to situation.We can be with a current channel 1 electrical equipment neutral line N ' of UNICOM and electrical equipment phase line L ', and with a current channel 2 electrical equipment neutral line N ' of UNICOM and electrical equipment appearance G ', in the situation that power supply connection of being connected with electrical equipment, current channel 2 does not have electric current; In 5 the various situations from situation 2 to situation, current channel 2 has current flowing, thereby by detecting the electric current of current channel 2, can detect situation 2 to the situation of situation 5, and then these erroneous condition of indication warning or cut off the electricity supply and being connected of electrical equipment, reach the purpose of detection of electrical leakage and protection.In addition; we are with power channel and the electrical equipment neutral line N ' of amplification executive circuit by presetting of current leakage detection protection system; electrical equipment phase line L ' and electrical equipment appearance G ' are directly or indirectly be connected; make that leakage protection circuit can obtain working power in above-mentioned various false wiring situations, thereby overcome the above-mentioned deficiency of prior art.
Above-mentioned purpose of the present invention can realize by the following technical solutions.A kind of method of electrical equipment appearance detection of electrical leakage protection is proposed:
1, the electric current between the monitoring electrical equipment neutral line and electrical equipment appearance.
If 2 find electric current between the electrical equipment neutral lines and electrical equipment appearance greater than predetermined operating valve value, trigger and amplify executive circuit and report to the police being connected of indication or disconnection electrical equipment and power supply.
Said amplification executive circuit, by default power channel and the electrical equipment neutral line, the electrical equipment phase line is direct with the electrical equipment appearance or indirectly be connected, to obtain required working power.
For realizing above-mentioned purpose of the present invention and electrical equipment appearance detection of electrical leakage means of defence, a kind of electrical equipment appearance detection of electrical leakage guard system is proposed:
A kind of detection of electrical leakage guard system has comprised testing circuit 3 and has amplified executive circuit 4, has also comprised one or more current channels and one or more power channel.
Described current channel comprises current channel 1 and current channel 2, the components and parts connecting circuit phase line L ' of the current channel 1 negotiable electric current of use and electrical equipment neutral line N ', the components and parts connecting circuit neutral line N ' of the current channel 2 negotiable electric currents of use and electrical equipment appearance G '; Adjust the parameter of components and parts in current channel 2, make when the voltage between electrical equipment neutral line N ' and electrical equipment appearance G ' equals between power supply phase line L and the power supply neutral line N voltage, the electric current between electrical equipment neutral line N ' and electrical equipment appearance G ' is less than the human-body safety electric current.
Described testing circuit 3 comprises current transfer device, and its input current can comprise the electric current of the current channel 2 of flowing through; The electric current that also can comprise the current channel 2 of flowing through, the electric current of the electric current of the electrical equipment phase line of flowing through L ' and the electrical equipment neutral line N ' that flows through; Its output connects the input that amplifies executive circuit 4.
Described amplification executive circuit 4 can comprise one or more and amplify and the executive circuit unit, the signal of telecommunication can be amplified and being connected of cut-out electrical equipment and power supply.
Described power channel can be to comprise three-phase commutation bridge, and three ac input ends of rectifier bridge are circuit closer phase line L ' respectively, electrical equipment neutral line N ' and electrical equipment appearance G ', and positive pole and the negative pole of rectifier bridge output connect respectively the positive-negative power that amplifies executive circuit 4; Can be also to comprise two or two above diodes, connect the working power of the amplification of amplifying executive circuit 4 and executive circuit unit after the diode same polarity is connected, all the other of diode are connecting pin not, a circuit closer appearance G ', a circuit closer phase line L '; Can be also to comprise two wires, a circuit closer appearance G ' of a conductor, a circuit closer neutral line N ' of an other conductor, other two working power ends that connect the amplification of amplifying executive circuit 4 and executive circuit unit of two conductors; Can also be to comprise two or more wire windings that are wound on same relay, a circuit closer phase line L ' of a winding, one connects independent an amplification and executive circuit unit output, a circuit closer appearance G ' of a winding, one connects that another one is independently amplified and executive circuit unit output.
Compare with technology formerly, the beneficial effect of the method and system of the invention described above is:
1. by the electric current of predetermined current passage and monitoring current passage, can find the electric leakage of electrical equipment appearance before human body contacts appearance, and then report to the police or cut off the electricity supply, eliminate accident potential.
2. obtained the working power of earth leakage protective device under the false wiring condition by power channel is set, the electrical equipment appearance that makes protective device to process to cause due to false wiring is charged;
3. by presetting the size of electric current between the electrical equipment neutral line and electrical equipment appearance; make in the situation that the power supply phase line misconnection electrical equipment neutral line and current leakage detection protection thrashing; the electric current that human body contact appearance produces can not cause injury to the people less than the human-body safety electric current.
4. float at electrical equipment, namely the electrical equipment appearance does not namely connect the power ground line, in earth-free situation yet, still can correctly find the electric leakage of electrical equipment appearance and indication warning or cut off being connected of electrical equipment and power supply.
5. earth leakage protective device of the present invention is simple for structure, and is reliable and cost is low, can widely apply.
Description of drawings Fig. 1 is the schematic diagram of method of the present invention.
Fig. 2 is the electrical schematic diagram of most preferred embodiment 1 of the present invention, adopts the power channel of an amplification and executive circuit unit and three phase rectifier bridge construction.
Fig. 3 is the electrical schematic diagram of most preferred embodiment 2 of the present invention, adopts the power channel of an amplification and executive circuit unit and double diode structure.
Fig. 4 is the electrical schematic diagram of most preferred embodiment 3 of the present invention, adopts the power channel of an amplification and executive circuit unit and conductor structure.
Fig. 5 is the electrical schematic diagram of most preferred embodiment 4 of the present invention, adopts the power channel of two amplifications and executive circuit unit and double-winding structure.
Fig. 6 is the electrical schematic diagram of most preferred embodiment 5 of the present invention, and line current and electrical equipment neutral current are monitored mutually to current channel electric current and electrical equipment simultaneously.
In figure: current channel 1 current channel 2 testing circuits 3 amplify executive circuit 4 power channel 5
Preferred forms is described in further detail the present invention below in conjunction with each accompanying drawing.
Fig. 1 is operating condition and the concrete steps of the inventive method.As shown in fig. 1, operating condition of the present invention is:
1. with current channel 1 connecting circuit phase line L ' and electrical equipment neutral line N ', with current channel 2 connecting circuit neutral line N ' and electrical equipment appearance G '.
2. will amplify the direct or indirect joint of executive circuit 4 to electrical equipment appearance G ' with power channel 5, electrical equipment appearance G ' and electrical equipment phase line L '.
3. the electric current between default electrical equipment neutral line N ' and electrical equipment appearance G ' makes it less than the human-body safety electric current.
Concrete grammar step of the present invention is:
1. monitor the electric current between the electrical equipment neutral line and electrical equipment appearance;
2. if the electric current between the discovery electrical equipment neutral line and electrical equipment appearance is greater than predefined operating valve value, trigger alarm indication immediately or disconnection electrical equipment are connected with power supply.
Embodiment 1:
Fig. 2 is the electrical schematic diagram of the embodiment 1 of system of the present invention.Wherein AC power AC is comprised of phase line L and neutral line N.Power supply AC is connected with electrical equipment neutral line N through electrical equipment phase line L ' and is connected the normally closed switch J1 that can thread off and power to the electrical equipment load.Electrical equipment appearance G ' floats.Current channel 1 is by rectifier bridge BR1, and resistance R 1 and LED 1 form.Two ac input ends of rectifier bridge BR1, a termination electrical equipment phase line L ', a termination electrical equipment neutral line N '; Two dc output ends of rectifier bridge BR1 connect respectively the two ends of the series loop of R1 and LED1, and wherein R1 is current-limiting resistance, are 36K in this example; LED 1 is common light-emitting diode.Be connected with electrical equipment neutral line N with electrical equipment phase line L ' with neutral line N as power supply phase line L when being connected, it is shinny that the average anode current of rectifier bridge BR1 drives LED 1 through R1, and the indication electric appliance load has been connected to power supply AC.Current channel 2 is by rectifier bridge BR2, and resistance R 2 and LED 2 form.Two ac input ends of rectifier bridge BR2, a termination electrical equipment neutral line N ', an other end be the elementary circuit closer appearance G ' of current transformer TA as a result; Two dc output ends of rectifier bridge BR2 connect respectively the series loop two ends of R2 and LED2, the value of R2 makes the electric current between electrical equipment neutral line N ' and electrical equipment appearance G ', in the situation that the voltage between electrical equipment neutral line N ' and electrical equipment appearance G ' equals power supply AC voltage, less than human-body safety electric current (this example is less than 30 milliamperes).This routine R2 value is 33K.When power supply phase line L and neutral line N were connected to electrical equipment neutral line N ' and electrical equipment appearance G ' mistakenly, the ac input end of rectifier bridge BR1 lost AC power supplies, and LED 1 does not work, and current channel 1 does not have electric current; The ac input end of rectifier bridge BR2 obtains AC power supplies, and LED 2 is bright, current channel 2 generation currents, and triggering amplification executive circuit 4 cut-out electrical equipment are connected with power supply.Can not work and LED2 is bright judges power supply phase line L and neutral line N is connected to electrical equipment neutral line N ' and electrical equipment appearance G ' mistakenly according to LED1 thus.When power supply phase line L and neutral line N are connected to electrical equipment phase line L ' and electrical equipment appearance G ' mistakenly, the ac input end of rectifier bridge BR2 is connected to AC power supplies by power channel 1, power channel 2 generation currents, triggering amplification executive circuit 4 cut-out electrical equipment are connected with power supply.Rectifier bridge BR2 and rectifier bridge BR1 obtain about 1/2 power supply AC voltage separately due to this moment, and LED 2 is all bright with LED 1, and indication power supply phase line L and neutral line N are connected to electrical equipment phase line L ' and electrical equipment appearance G ' mistakenly.When power supply phase line L misconnection electrical equipment neutral line N ' and power supply neutral line N misconnection electrical equipment phase line L ', power supply phase line L voltage is delivered to the electrical equipment appearance by current channel 2, if at this moment human body contact electrical equipment appearance G ' will cause power supply phase line L voltage to pass through by current channel 2, loop generation current passage 2 electric currents that human body and the earth form, trigger the detection of electrical leakage guard system cut off the electricity supply rapidly with being connected of electrical equipment (in this example the break time＜0.1S).Just in case the detection of electrical leakage guard system lost efficacy and can't cut off the electricity supply, because the electric current of current channel 2 is pre-arranged less than the human-body safety electric current, therefore can not cause damage to human body yet.
Amplify executive circuit 4 and contain the amplification that formed by controllable silicon amplification and control circuit and relay circuit and executive circuit unit.Wherein controllable silicon amplification and control circuit comprise resistance R 3, diode D1 and controllable silicon SCR.Resistance R 3 is connected in the triggering loop of controllable silicon SCR with the restriction trigger current; Diode D1 is in parallel with the trigger end of controllable silicon SCR to suppress reverse trigger voltage.Relay circuit comprises the relay J 1 of connecting with controllable silicon SCR.Controllable silicon in the present embodiment amplifies and control circuit, also available other integrated circuits, and for example the M54123 leakage protection circuit substitutes, and the function of realization is constant.
When charged or electrical equipment and power supply wiring mistake cause current channel 2 generation current as electrical equipment appearance G ', the secondary generation voltage of the current transformer TA of testing circuit 3, trigger the controllable silicon SCR conducting, no matter this moment, power supply phase line L and power supply neutral line N were how connecting circuit phase line L ' and electrical equipment neutral line N ' and electrical equipment appearance G ', electric current is always arranged from the power supply phase line L rectifier bridge 3BR that flows through, relay J 1 winding and controllable silicon SCR, then turn back to power supply neutral line N, the J1 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.
Due to before current channel 1 and current channel 2 be connected to relay J 1 switch, making leakage protection system move and cut off electrical equipment at J1 is connected with power supply after connection, light-emitting diode in current channel still keep the reporting to the police reason of indicating status and indication fault: LED 1 is bright, LED 2 does not work, explanation is the electric leakage from power supply phase line L to electrical equipment appearance G ', or power supply phase line L has caused the protection action with neutral line N reversal connection and there is the people to contact electrical equipment appearance G '; LED 1 does not work, and LED 2 is bright, and explanation is the phase line L of power supply and neutral line N ' and the electrical equipment appearance G ' that neutral line N misconnection has arrived electrical equipment, has caused the protection action; LED 1 and LED 2 are all bright, and explanation is the phase line L of power supply and phase line L ' and the electrical equipment appearance G ' that neutral line N misconnection has arrived electrical equipment, have caused the protection action.
Embodiment 2:
Fig. 3 is the electrical schematic diagram of the embodiment 2 of system of the present invention.Its power supply is connected connected mode and current channel 1 and current channel 2 structures and wiring with embodiment 1 with load; Difference is that power channel 5 comprises diode D2 and diode D3.Diode D2 and diode D3 same polarity are joined (this routine Anodic joins) and are connected to relay J 1 winding, the other utmost point connecting circuit appearance G ' of diode D2, the other utmost point connecting circuit phase line L ' of diode D3.When charged or electrical equipment and power supply wiring mistake cause current channel 2 generation current as electrical equipment appearance G ', the secondary generation voltage of the current transformer TA of testing circuit 3, trigger the controllable silicon SCR conducting, if this moment, power supply phase line L and power supply neutral line N were connecting circuit phase line L ' and electrical equipment neutral line N ', electric current will be arranged from electrical equipment phase line L ' process diode D3, relay J 1 winding and controllable silicon SCR arrive electrical equipment neutral line N ', the J1 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.If this moment, power supply phase line L and power supply neutral line N were connecting circuit appearance G ' and electrical equipment neutral line N ', electric current will be arranged from electrical equipment appearance G ' process diode D2, relay J 1 winding and controllable silicon SCR arrive electrical equipment neutral line N ', the J1 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.If this moment, power supply phase line L and power supply neutral line N were connecting circuit phase line L ' and electrical equipment appearance G ', at this moment two-way electric current relay J 1 winding of flowing through will be arranged: one road electric current is from electrical equipment phase line L the ', through diode D3, relay J 1 winding and controllable silicon SCR arrive at rear continuation of electrical equipment neutral line N ' and arrive electrical equipment appearance G ' by current channel 2; Other one road electric current is from electrical equipment appearance G the ', and through diode D2, relay J 1 winding and controllable silicon SCR continue to arrive electrical equipment phase line L ' by current channel 1 after arriving at electrical equipment neutral line N '; J1 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.Due to relay J 1 in a short period of time (this example for＜0.1S) just broken away from power supply after cutting off the electricity supply, so can work in wider instantaneous current margin.
The indication warning meaning of the light-emitting diode of the present embodiment is identical with embodiment 1.
Embodiment 3:
Fig. 4 is the electrical schematic diagram of the embodiment 3 of system of the present invention.Its power supply is connected connected mode and current channel 1 and current channel 2 structures and wiring with embodiment 1 with load; Difference is, wherein power channel 5 is two bar wires, a circuit closer appearance G ' of a conductor, a circuit closer neutral line N ' of an other conductor, other two working power ends that connect the amplification of amplifying executive circuit 4 and executive circuit unit of two conductors.Compare with embodiment 2 with embodiment 1, the amplification executive circuit 4 of the present embodiment 3 directly obtains AC voltage in power supply phase line L and power supply neutral line N circuit closer neutral line N ' and electrical equipment appearance G ', in power supply phase line L and power supply neutral line N circuit closer phase line L ' and electrical equipment appearance G ', indirectly obtain AC voltage by current channel 1, the relay J 1 that therefore requires to amplify in executive circuit 4 can be operated in wider current range.
The indication warning meaning of the light-emitting diode of the present embodiment is identical with embodiment 1.
Embodiment 4:
Fig. 5 is the electrical schematic diagram of the embodiment 4 of system of the present invention.Its power supply is connected connected mode and current channel 1 and current channel 2 structures and wiring with embodiment 1 with load; Difference is, testing circuit 3 instrument transformer TA have two secondary outputs, trigger respectively two independently, and example 1 amplifies and drive circuit 4 similarly amplification and executive circuit unit.Two mutual disjunct windings that are wound on same relay have served as power channel 5, a circuit closer appearance G ' of a winding, one connects the switching circuit that is comprised of rectifier bridge BR3 controllable silicon SCR 1, a circuit closer phase line L ' of another one winding, one connects the switching circuit that is comprised of rectifier bridge BR4 controllable silicon SCR 2.
When or electrical equipment charged due to electrical equipment appearance G ' and power supply wiring mistake caused current channel 2 generation current, two secondary generation voltages of the current transformer TA of testing circuit 2 triggered respectively controllable silicon SCR 1 and controllable silicon SCR 2.If this moment, power supply phase line L and power supply neutral line N were connecting circuit phase line L ' and electrical equipment neutral line N ', electric current will be arranged from relay J 2 windings and rectifier bridge BR4 and the controllable silicon SCR 2 arrival electrical equipment neutral line Ns ' of electrical equipment phase line L ' process as power channel 5, the J2 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.If this moment, power line was connecting circuit appearance G ' and electrical equipment neutral line N ', electric current will be arranged from relay J 2 windings and rectifier bridge BR3 and the controllable silicon SCR 1 arrival electrical equipment neutral line N ' of electrical equipment appearance G ' process as power channel 5, the J2 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.If this moment, power line was connecting circuit phase line L ' and electrical equipment appearance G ', at this moment flow through two windings of relay J 2 of two-way electric current will be arranged: one road electric current is from electrical equipment phase line L the ', continues to arrive electrical equipment appearance G ' by current channel 2 after arriving at electrical equipment neutral line N ' as relay J 2 winding of power channel 5 and rectifier bridge BR4 and controllable silicon SCR 2; Other one road electric current is from electrical equipment appearance G the ', through another relay J 2 windings and rectifier bridge BR3 and the controllable silicon SCR 1 as power channel 5, continues to arrive electrical equipment phase line L ' by current channel 1 after arriving at electrical equipment neutral line N '; J1 action, normally-closed contact disconnects, and cuts off electrical equipment and is connected connection with power supply.
The indication warning meaning of the light-emitting diode of the present embodiment is identical with embodiment 1.
Embodiment 5:
Fig. 6 is the electrical schematic diagram of the embodiment 5 of system of the present invention.Compare with other embodiment, the difference of embodiment 5 only is measuring circuit 3: the current transformer TA that comprises, and its primary current has not only comprised current channel 2 electric currents, and has comprised electrical equipment phase line L ' electric current and electrical equipment neutral line N ' electric current; Thereby make when causing that when leaking electricity the phase line current that flows into instrument transformer TA is not equal to the neutral current that flows out instrument transformer TA, can produce residual current and set up secondary voltage, triggering amplification executive circuit 4 disconnection electrical equipment are connected with power supply.The meaning of the testing process of 5 pairs of current channels 2 of embodiment and light-emitting diode warning indication no longer repeats as described in Example 1.
The present embodiment is equally applicable to the detection of electrical leakage protection that power supply is the electrical equipment of three phase mains, only needs the power supply phase line L that current transformer is elementary to substitute with the three-phase phase line and gets final product.
Claims (10)
1. the detection means of defence of an electrical equipment appearance electric leakage, is characterized in that, it comprises the following steps: the electric current between (1) monitoring electrical equipment neutral line and electrical equipment appearance; (2) if find electric current between the electrical equipment neutral line and electrical equipment appearance greater than predetermined operating valve value, trigger and amplify executive circuit and report to the police being connected of indication or disconnection electrical equipment and power supply.
2. the detection means of defence of electrical equipment appearance according to claim 1 electric leakage, it is characterized in that said amplification executive circuit, by default power channel and the electrical equipment neutral line, the electrical equipment phase line is direct with the electrical equipment appearance or indirectly be connected, to obtain required working power.
3. the detection guard system of electrical equipment appearance electric leakage, inclusion test circuit (3) and amplify executive circuit (4) is characterized in that system also comprises one or more current channels and one or more power channel.
4. electrical equipment appearance detection of electrical leakage guard system according to claim 3, is characterized in that said current channel comprises current channel (1) and current channel (2); Current channel (1) is with the components and parts connecting circuit phase line of negotiable electric current (L ') and the electrical equipment neutral line (N '); Current channel (2) is with the components and parts connecting circuit neutral line of negotiable electric current (N ') and electrical equipment appearance (G ').
5. electrical equipment appearance detection of electrical leakage guard system according to claim 4, is characterized in that said electrical equipment neutral line N ' and electrical equipment appearance G ', between electric current be predetermined to be less than the human-body safety electric current.
6. electrical equipment appearance detection of electrical leakage guard system according to claim 3, is characterized in that said testing circuit (3) comprises current transfer device, and its input current can comprise the electric current of the current channel of flowing through (2); Also can comprise the electric current of the current channel of flowing through (2), the electric current of the electric current of the electrical equipment phase line of flowing through (L ') and the electrical equipment neutral line of flowing through (N '); Its output connects the input that amplifies executive circuit (4).
7. electrical equipment appearance detection of electrical leakage guard system according to claim 3, it is characterized in that said power channel comprises three-phase commutation bridge, three ac input ends difference circuit closer phase lines of rectifier bridge (L '), the electrical equipment neutral line (N ') and the electrical equipment appearance (G '); Positive pole and the negative pole of rectifier bridge output connect respectively the positive-negative power that amplifies executive circuit (4).
8. electrical equipment appearance detection of electrical leakage guard system according to claim 3, it is characterized in that said power channel comprises two or two above diodes, after being connected, the diode same polarity connects the working power of the amplification of amplifying executive circuit (4) and executive circuit unit, all the other of diode are connecting pin not, circuit closer appearance (G '), circuit closer phase line (L ').
9. electrical equipment appearance detection of electrical leakage guard system according to claim 3, it is characterized in that said power channel comprises two wires, a circuit closer appearance of a conductor (G '), a circuit closer neutral line of an other conductor (N '), other two working power ends that connect the amplification of amplifying executive circuit (4) and executive circuit unit of two conductors.
10. electrical equipment appearance detection of electrical leakage guard system according to claim 3, it is characterized in that said power channel comprises two or more wire windings that are wound on same relay, a circuit closer phase line of a winding (L '), one connects independent an amplification and executive circuit unit output, a circuit closer appearance of a winding (G '), one connects that another one is independently amplified and executive circuit unit output.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110385096.4A CN103107514B (en) | 2011-11-12 | 2011-11-12 | The detection means of defence of electricity leakage on outer surface of electrical equipment and system |
| GB1408528.6A GB2510521B (en) | 2011-11-12 | 2011-12-12 | Method of electricity leakage detection and prevention of electrical equipment's outer surface and system thereof |
| US14/350,089 US9928980B2 (en) | 2011-11-12 | 2011-12-12 | Method of electricity leakage detection and prevention of electrical equipment's outer surface and system thereof |
| AU2011380682A AU2011380682B2 (en) | 2011-11-12 | 2011-12-12 | Method of electricity leakage detection and prevention of electrical equipment's outer surface and system thereof |
| PCT/CN2011/083810 WO2013067729A2 (en) | 2011-11-12 | 2011-12-12 | Method of electricity leakage detection and prevention of electrical equipment's outer surface and system thereof |
| CA2853175A CA2853175C (en) | 2011-11-12 | 2011-12-12 | Method of electricity leakage detection and prevention of electrical equipment's outer surface and system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110385096.4A CN103107514B (en) | 2011-11-12 | 2011-11-12 | The detection means of defence of electricity leakage on outer surface of electrical equipment and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103107514A true CN103107514A (en) | 2013-05-15 |
| CN103107514B CN103107514B (en) | 2015-12-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110385096.4A Active CN103107514B (en) | 2011-11-12 | 2011-11-12 | The detection means of defence of electricity leakage on outer surface of electrical equipment and system |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US9928980B2 (en) |
| CN (1) | CN103107514B (en) |
| AU (1) | AU2011380682B2 (en) |
| CA (1) | CA2853175C (en) |
| GB (1) | GB2510521B (en) |
| WO (1) | WO2013067729A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552824A (en) * | 2016-02-03 | 2016-05-04 | 吴伟 | Novel method and device for obtaining working power supply of electric shock or electric leakage protector |
| CN108771491A (en) * | 2018-05-24 | 2018-11-09 | 宁波国盛电器有限公司 | A kind of sandwich unit |
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| CN103633613B (en) * | 2013-11-18 | 2016-06-15 | 陈栋 | Too little current automatic power-off protection circuit and charger |
| CN105182046A (en) * | 2015-09-25 | 2015-12-23 | 深圳供电局有限公司 | Current voltage transformer secondary neutral grounding current acquisition device |
| CN113534005B (en) * | 2021-06-24 | 2022-10-21 | 宁波方太厨具有限公司 | Electric leakage detection method of cleaning machine |
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- 2011-11-12 CN CN201110385096.4A patent/CN103107514B/en active Active
- 2011-12-12 CA CA2853175A patent/CA2853175C/en active Active
- 2011-12-12 US US14/350,089 patent/US9928980B2/en active Active
- 2011-12-12 AU AU2011380682A patent/AU2011380682B2/en active Active
- 2011-12-12 WO PCT/CN2011/083810 patent/WO2013067729A2/en active Application Filing
- 2011-12-12 GB GB1408528.6A patent/GB2510521B/en active Active
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| CN2234660Y (en) * | 1995-03-23 | 1996-09-04 | 谭均恒 | Multifunctional electric leakage protection switch |
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| CN108771491A (en) * | 2018-05-24 | 2018-11-09 | 宁波国盛电器有限公司 | A kind of sandwich unit |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2510521A (en) | 2014-08-06 |
| CA2853175C (en) | 2020-10-20 |
| WO2013067729A2 (en) | 2013-05-16 |
| US9928980B2 (en) | 2018-03-27 |
| GB2510521B (en) | 2016-12-14 |
| GB201408528D0 (en) | 2014-06-25 |
| CA2853175A1 (en) | 2013-05-16 |
| AU2011380682B2 (en) | 2017-05-11 |
| WO2013067729A3 (en) | 2013-07-04 |
| CN103107514B (en) | 2015-12-16 |
| US20140239744A1 (en) | 2014-08-28 |
| AU2011380682A1 (en) | 2014-06-12 |
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